Remove arkose_labs_signup_challenge feature flag

app/controllers/registrations_controller.rb

doc/development/identity_verification.md

doc/integration/arkose.md

ee/app/assets/javascripts/pages/registrations/new/index.js

ee/app/controllers/concerns/arkose/token_verifiable.rb

ee/app/controllers/ee/registrations_controller.rb

ee/app/controllers/users/identity_verification_controller.rb

ee/app/workers/arkose/blocked_users_report_worker.rb

...eature_flags/development/arkose_labs_signup_challenge.yml

ee/lib/arkose/settings.rb

ee/spec/controllers/ee/registrations_controller_spec.rb

ee/spec/features/invites_spec.rb

ee/spec/features/registrations/email_confirmation_spec.rb

...ith_trial_from_external_site_without_confirmation_spec.rb

...art_trial_from_external_site_without_confirmation_spec.rb

ee/spec/features/signup_spec.rb

ee/spec/lib/arkose/settings_spec.rb

ee/spec/requests/trial_registrations_controller_spec.rb

...ort/shared_contexts/saas_registration_settings_context.rb

...mples/features/signup_arkose_challenge_shared_examples.rb